1.模仿fade in(),fade out().

原理：setInterval ( "opacity++透明度“函数，时间间隔）

var alpha = 0;function play(){timer = setInterval(function(){alpha += 2;alpha > 100 && (alpha = 100);aImg[index].style.opacity = alpha / 100;aImg[index].style.filter = "alpha(opacity = " + alpha/100 + ")";alpha == 100 && clearInterval(timer);},40)}

2.获取和设置元素对象的属性值：

关键点：obj.currentStyle[attr] ； getComputedStyle(obj,null)[attr] ；

function css(obj,attr,val) {switch(arguments.length) {case 2:if(typeof arguments[1] == "string"){return obj.currentStyle ? obj.currentStyle[attr] : getComputedStyle(obj,null)[attr];}else{for(var i in attr) {obj.style[i] = attr[i];}}break;case 3:obj.style[attr] = val;break;default:alert("错误参数");}}

以上所述是小编给大家介绍的JS功能代码集锦的相关内容，希望对大家有所帮助！